/**克隆对象或者数组 【解决从接口拿来的数据不可扩展】**/
export function getRandNum(){
    var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];
     var randomNum = "";
     for(var i=0;i<32;i++){
        var id = parseInt(Math.random()*61);
        randomNum += chars[id];
     }
     return randomNum;
}